(1.廈門工學(xué)院機(jī)械與材料工程學(xué)院，廈門 361021；
2. 廈門大學(xué)材料學(xué)院，廈門 361005；
3. 廈門大學(xué)福建省特種先進(jìn)材料重點實驗室，廈門 361005)
摘 要: 利用原位XRD技術(shù)研究未極化摻鑭鋯鈦酸鉛(PLZT)鐵電陶瓷在不同直流電場加載過程中(002)和(200)衍射峰峰強(qiáng)與電場強(qiáng)度的關(guān)系，基于鐵電疇取向分布的考慮，對(002)和(200)衍射峰峰強(qiáng)進(jìn)行定量分析。通過對原位XRD譜進(jìn)行四方相和單斜相的分峰擬合處理，初步探討電場強(qiáng)度對鐵電陶瓷電致疇變和電致相變的影響。結(jié)果表明：對于PLZT試樣，在電場加載過程中除了發(fā)生電致90°疇變外，還可能發(fā)生從四方相到單斜相的電致相變。在不同電場強(qiáng)度作用下，電致疇變與電致相變是一個相互競爭的過程，電致疇變是主要的，而電致相變相對減少。
關(guān)鍵字: 鐵電陶瓷；原位XRD；電致疇變；相變
（1. College of Mechanical and Materials Engineering, Xiamen Institute of Technology, Xiamen 361021, China;
2. College of Materials, Xiamen University, Xiamen 361005, China;
3.Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, China）
Abstract:Variations of the peak intensities of (002) and (200) diffraction peaks (I(002), I(200)) with the applied electric fields were studied by in-situ X-ray diffraction method during the applications of different electric fields on the unpoled lanthanum-doped lead zirconate titanate (PLZT) ceramics. Considering the distribution of domain orientation, the quantitative analyses of peak intensities of I(002) and I(200) were performed. Based on the multi-peak curve fitting to the in-situ XRD spectra, the effects of the applied electric fields on the electric-field-induced domain switching and phase transition were preliminarily discussed. The results show that the electric-field-induced 90° domain switching occurs in PLZT specimens under the applied electric fields, at the same time, the electric-field-induced phase transition from tetragonal to monoclinic could also happen. The electric-field-induced domain switching and phase transition occur competitively in different electric fields. The major process is domain switching, while the minor process is phase transition.
Key words: ferroelectric ceramics; in-situ XRD; electric-field-induced domain switching; phase transition
